CN115322758B - High-temperature and high-pressure resistant drilling fluid plugging agent - Google Patents
High-temperature and high-pressure resistant drilling fluid plugging agent Download PDFInfo
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- CN115322758B CN115322758B CN202211046417.2A CN202211046417A CN115322758B CN 115322758 B CN115322758 B CN 115322758B CN 202211046417 A CN202211046417 A CN 202211046417A CN 115322758 B CN115322758 B CN 115322758B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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Abstract
The invention discloses a high-temperature and high-pressure resistant drilling fluid plugging agent, which consists of a flaky material, a granular material and a fiber material, wherein the plugging agent is added into the drilling fluid to prepare plugging slurry, and then the plugging slurry is injected into a stratum, and the mass concentration of each component in the plugging slurry is as follows: 50-120 g/L of sheet material, 40-130 g/L of particle material and 80-120 g/L of fiber material; the sheet material comprises thermosetting resin sheet material and calcite sheet material; the thermosetting resin sheet material is formed by mixing new phenolic resin and phenolic resin according to the mass ratio of 1 (2.8-3.1) or mixing phenolic resin and melamine formaldehyde resin according to the mass ratio of 2:1 and tabletting, wherein the thickness is 0.3-0.5 mm, and the thermosetting resin sheet material is smooth and textured on one side. The calcite sheet material is a sheet with soft texture and easy bending and deformation. The particle material is calcium carbonate particles or quartz particles. The plugging agent effectively solves the problem that the traditional plugging agent has invalid performance under the conditions of high temperature and high pressure.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a high-temperature and high-pressure resistant drilling fluid plugging agent.
Background
The south China sea warole agar basin is one of three high-temperature and high-pressure gathering areas of the world, is also a main battlefield for natural gas exploration in the south China sea area, and has a far-reaching prospect in oil and gas exploration. The main purpose layer yellow flow group two-section drilling is frequent in lost circulation, large in plugging difficulty and low in plugging success rate, well drilling efficiency and well control safety are seriously affected, and exploration and development processes of the tectorial membrane basin are restricted. The existing leakage-proof and plugging material has the problem of insufficient performance and poor plugging effect.
The conventional plugging materials (such as mica sheets, walnut shells, rubber, cotton seed hulls and the like) at present have poor plugging effect due to insufficient high-temperature and high-pressure resistance in the plugging operation process of high-temperature and high-pressure stratum. The conventional plugging agent is easy to carbonize and degrade under the high-temperature condition, the original performance of the plugging agent is changed, the performance of drilling fluid is also reduced, and the plugging success rate is low, and repeated leakage frequently occurs. In addition, the conventional plugging agent particles are mainly concentrated below 9 meshes (the diameter is about 1.98 mm), the particle size distribution is low, the plugging agent is only suitable for plugging micro cracks, and when the cracks with larger opening degree need to be plugged, the plugging coverage rate is too low, and the plugging effect is poor.
In the high-temperature and high-pressure stratum plugging process, the problems are specifically expressed as follows: 1. after high-temperature aging, the appearance forms of walnut shells, rubber, cotton seed shells, fibers and the like are obviously changed; 2. organic plant materials such as walnut shells and the like are subjected to coking degradation after high-temperature aging, and organic polymer materials such as rubber and the like are subjected to melting degradation after high-temperature aging; 3. the compressive strength of the walnut shell and other organic plant materials is obviously reduced after high-temperature aging, and the elastic deformation rate of the rubber is obviously reduced after aging; 4. the high-temperature aging effect reduces the surface friction coefficient of plugging materials such as walnut shells, and the like, so that the stability of a force chain network in the formed plugging layer structure is weakened, shearing dislocation instability is easy to occur, and repeated leakage is caused; 5. the walnut shell and other plant particles are degraded at high temperature, the particle size is reduced, the original stratum crack opening cannot be effectively bridged and plugged, and the plugging efficiency is reduced.
Therefore, aiming at the rare high-temperature and high-pressure stratum (the underground temperature is generally higher than 180 ℃ and the pressure coefficient is close to 2.3) such as the oriole basin in the south China sea, the conventional plugging agent and the plugging process cannot meet the field condition, and new materials and new technologies are needed to solve the problem of leakage in the area.
Disclosure of Invention
Aiming at the problems, the invention provides a high-temperature and high-pressure resistant drilling fluid plugging agent. The plugging agent has high-temperature and high-pressure resistance, and can effectively solve the problem of performance failure of the traditional plugging agent under high-temperature and high-pressure conditions.
The invention provides a high-temperature and high-pressure resistant drilling fluid plugging agent which is composed of a sheet material, a particle material and a fiber material. The plugging agent is added into drilling fluid to prepare plugging slurry, and then the plugging slurry is injected into a stratum, wherein the mass concentration of each component in the plugging slurry is as follows:
50-120 g/L of sheet material, 40-130 g/L of particle material and 80-120 g/L of fiber material.
The sheet material includes thermosetting resin sheet material and calcite sheet material.
The thermosetting resin sheet material is formed by mixing new phenolic resin and phenolic resin according to the mass ratio of 1 (2.8-3.1) or mixing phenolic resin and melamine formaldehyde resin according to the mass ratio of 2:1 and tabletting, wherein the thickness is 0.3-0.5 mm, and one surface is smooth and the other surface is textured; the flaky materials are divided into two types according to the size of particle sizes, wherein the first particle size is 3-5 mm, and the second particle size is 1-3mm; when in use, one or two particle sizes are selected for compounding.
The calcite sheet material is formed by tabletting calcite, has soft texture, is easy to bend and deform, and can adapt to cracks with different sizes. The particle sizes are divided into two types according to the particle size, wherein the first particle size is 3-5 mm, and the second particle size is 1-3mm; when in use, one or two particle sizes are selected for compounding.
The particle materials are calcium carbonate particles or quartz particles, the particle materials are divided into 3 types according to the size of particle sizes, the first particle size is 2-3.35 mm, the second particle size is 1-2 mm, and the third particle size is 0.5-1 mm; when in use, one particle size or a plurality of particle sizes are selected for compounding.
The fiber material is one or a mixture of more of ceramic fiber, sepiolite fiber, asbestos fiber, basalt fiber and brucite fiber; the length of the fiber is 0.1-12 mm, and the diameter is 80-150 mu m.
Preferably, for 1.5-0.5 mm cracks, the mass concentration of each component in the plugging slurry is as follows:
50g/L of sheet material, 40g/L of granular material and 80g/L of fibrous material;
wherein, the particle size of the flaky materials is 1-3mm; the mass ratio of the thermosetting resin sheet material to the calcite sheet material is 3:2; the thermosetting resin sheet material is formed by mixing and tabletting new phenolic resin and phenolic resin;
the granular material is calcium carbonate particles with the particle size of 0.5-1 mm;
the fiber material is sepiolite fiber.
Preferably, for 3.0-1.0 mm cracks, the mass concentration of each component in the plugging slurry is as follows:
80g/L of sheet material, 50g/L of particle material and 90g/L of fiber material;
wherein, in the sheet material, the mass ratio of the sheet resin material with the thickness of 1-3mm to the sheet resin material with the thickness of 3-5 mm to the sheet calcite with the thickness of 1-3mm to the sheet calcite with the thickness of 3-5 mm is 1:1:1:1; the flaky resin material is formed by mixing phenolic resin and melamine formaldehyde resin and tabletting;
the granular material is prepared by mixing 0.5-1mm calcium carbonate particles and 1-2 mm calcium carbonate particles according to a mass ratio of 3:2;
the fiber material is a composite fiber material formed by mixing sepiolite fiber and asbestos wool according to the mass ratio of 1:2.
Preferably, for 5.0-3.0 mm cracks, the mass concentration of each component in the plugging slurry is as follows:
120g/L of sheet material, 130g/L of granular material and 120g/L of fiber material;
wherein, in the sheet material, the mass ratio of the sheet resin material with the thickness of 1-3mm to the sheet resin material with the thickness of 3-5 mm to the sheet calcite with the thickness of 1-3mm to the sheet calcite with the thickness of 3-5 mm is 2:4:3:3; the flaky resin material is formed by mixing phenolic resin and melamine formaldehyde resin and tabletting;
the granular material is prepared by mixing 0.5-1mm calcium carbonate particles, 1-2 mm calcium carbonate particles and 2-3.35 mm quartz particles according to a mass ratio of 5:4:4;
the fiber material is a composite fiber material formed by mixing sepiolite fiber, asbestos wool and ceramic fiber according to the mass ratio of 1:1:1.
The plugging agent provided by the invention is suitable for plugging cracks with the opening less than or equal to 5mm, and is added into drilling fluid according to the formula, and then injected into a crack leakage layer.
The plugging agent has the following plugging material collocation principle: the flaky material is easy to turn over in a narrow stratum, has high retention rate, can quickly form a plugging layer, and has insufficient stability; the granular material is used as a framework structure, has high hardness and is not easy to deform, but gaps among the grains are large and are not compact enough; the fiber materials are mutually involved to form a grid structure, so that the stability of the plugging layer can be enhanced, but the bearing capacity of the plugging layer is not strong. The advantages of the flaky plugging agent, the rigid particles and the fiber materials are comprehensively utilized to cooperatively plug the cracks, so that a compact pressure-bearing plugging layer with a 'strong chain network structure' can be effectively formed, the occurrence of repeated leakage is avoided, and the plugging range of the leakage cracks is widened.
Compared with the prior art, the invention has the following advantages:
(1) The material in the plugging agent provided by the invention has strong high-temperature and high-pressure resistance, has small performance change even no change in a high-temperature and high-pressure environment, and ensures the plugging effect of the material in a high-temperature and high-pressure leakage layer.
(2) The plugging agent provided by the invention has the advantages of multiple material types and wide particle size distribution range, can be used for plugging cracks with different openings at the same time, and has excellent adaptability plugging capability.
(3) The plugging agent provided by the invention adopts flaky materials, granular materials and fiber composite materials to cooperatively plug, can effectively form a compact pressure-bearing plugging layer with a 'strong chain network structure', avoids plugging failure and repeated leakage, and has a plugging pressure-bearing capacity of more than 20MPa.
(4) The sheet plugging material in the plugging agent is very easy to be embedded into the wall surface of the induced joint to form a bridge, and auxiliary fibers and fine granular plugging materials are filled in the residual pores, so that the induced joint can be plugged at a shallower position (15-22 mm) of the well wall, and further extension and expansion of the induced joint are prevented.
(5) The plugging agent provided by the invention has excellent capability of resisting 'back-spitting' of plugging slurry, and the reverse bearing capacity is more than 7 MPa.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 shows the particle size distribution of each plugging material in the plugging agent of example 3.
FIG. 2, plugging pressure curve and leak accumulation curve.
FIG. 3 is a physical diagram of the plugging agent of the invention forming a plugging layer in fractured steel rock.
FIG. 4, reverse blocking pressure graph.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
1. Preparation example
Example 1
Aiming at cracks of 1.5-0.5 mm, the plugging material provided by the embodiment consists of a sheet material, a particle material and a fiber material, wherein the mass concentration of each component in the plugging slurry is as follows:
50g/L of sheet material, 40g/L of granular material and 80g/L of fibrous material;
the sheet material is a sheet resin material and a sheet calcite material, wherein the sheet resin material is formed by mixing new phenolic resin and phenolic resin according to the mass ratio of 1:3 and tabletting.
The granular material is calcium carbonate.
The fiber material is sepiolite fiber.
Specifically, 30g of the flaky resin material with the particle size of 1-3mm, 20g of the flaky calcite material with the particle size of 1-3mm, 40g of the calcium carbonate particles with the particle size of 0.5-1mm and 80g of the sepiolite fiber are respectively weighed, and the materials are uniformly mixed to obtain the high-temperature and high-pressure resistant drilling fluid plugging agent. And adding the plugging agent into 1000mL of drilling fluid to obtain plugging slurry.
Example 2
Aiming at cracks of 3.0-1.0 mm, the plugging material provided by the embodiment consists of a sheet material, a particle material and a fiber material, wherein the mass concentration of each component in the plugging slurry is as follows:
80g/L of sheet material, 50g/L of particle material and 90g/L of fiber material;
the sheet material is a sheet resin material and a sheet calcite material, wherein the sheet resin material is formed by mixing phenolic resin and melamine formaldehyde resin according to a mass ratio of 2:1 and tabletting;
the particulate material is calcium carbonate.
The fiber material is a composite fiber material formed by mixing sepiolite fibers and asbestos wool according to the mass ratio of 1:2.
Specifically, 80g of the sheet material is weighed, wherein, the particle size of the sheet material is 20g of sheet resin material with the particle size of 1-3mm, the particle size of the sheet resin material with the particle size of 3-5 mm, the particle size of the sheet calcite material with the particle size of 1-3mm, and the particle size of the sheet calcite material with the particle size of 3-5 mm; weighing 50g of the calcium carbonate particles, wherein 30g of the calcium carbonate particles with the particle size of 0.5-1mm and 20g of the calcium carbonate particles with the particle size of 1-2 mm; 90g of the composite fiber material was weighed. And uniformly mixing the materials to obtain the high-temperature and high-pressure resistant drilling fluid plugging agent. And adding the plugging agent into 1000mL of drilling fluid to obtain plugging slurry.
Example 3
Aiming at cracks of 5.0-3.0 mm, the plugging material provided by the embodiment consists of a sheet material, a particle material and a fiber material, wherein the mass concentration of each component in the plugging slurry is as follows:
120g/L of sheet material, 130g/L of granular material and 120g/L of fiber material;
the sheet material is a sheet resin material and a sheet calcite material, wherein the sheet resin material is formed by mixing phenolic resin and melamine formaldehyde resin according to a mass ratio of 2:1 and tabletting.
The granular material is calcium carbonate and quartz granules.
The fiber material is a composite fiber material formed by mixing sepiolite fibers, asbestos wool and ceramic fibers according to the mass ratio of 1:1:1.
Specifically, 120g of the sheet material is weighed, wherein 20g of sheet resin material with the particle size of 1-3mm, 40g of sheet resin material with the particle size of 3-5 mm, 30g of sheet calcite material with the particle size of 1-3mm and 30g of sheet calcite material with the particle size of 3-5 mm are weighed; 130g of the calcium carbonate particles are weighed, wherein 50g of calcium carbonate particles with the particle size of 0.5-1mm, 40g of calcium carbonate particles with the particle size of 1-2 mm and 40g of quartz particles with the particle size of 2-3.35 mm are weighed; 120g of the composite fiber material was weighed. And uniformly mixing the materials to obtain the high-temperature and high-pressure resistant drilling fluid plugging agent. And adding the plugging agent into 1000mL of drilling fluid to obtain plugging slurry.
Comparative example 1
Aiming at cracks of 5.0-3.0 mm, the plugging material provided by the embodiment consists of a sheet material, a particle material and a fiber material, wherein the mass concentration of each component in the plugging slurry is as follows:
120g/L of sheet material, 130g/L of granular material and 120g/L of fiber material;
the sheet material is a sheet resin material, wherein the sheet resin material is formed by mixing phenolic resin and melamine formaldehyde resin according to a mass ratio of 2:1 and tabletting.
The granular material is calcium carbonate and quartz granules.
The fiber material is a composite fiber material formed by mixing sepiolite fibers, asbestos wool and ceramic fibers according to the mass ratio of 1:1:1.
Specifically, 120g of the sheet-like material is weighed, wherein 50g of the sheet-like resin material with the particle size of 1-3mm and 70g of the sheet-like resin material with the particle size of 3-5 mm are weighed; 130g of the calcium carbonate particles are weighed, wherein 50g of calcium carbonate particles with the particle size of 0.5-1mm, 40g of calcium carbonate particles with the particle size of 1-2 mm and 40g of quartz particles with the particle size of 2-3.35 mm are weighed; 120g of the composite fiber material was weighed. And uniformly mixing the materials to obtain the high-temperature and high-pressure resistant drilling fluid plugging agent. And adding the plugging agent into 1000mL of drilling fluid to obtain plugging slurry.
Comparative example 2
Aiming at cracks of 5.0-3.0 mm, the plugging material provided by the embodiment consists of a sheet material, a particle material and a fiber material, wherein the mass concentration of each component in the plugging slurry is as follows:
120g/L of sheet material, 130g/L of granular material and 120g/L of fiber material;
the sheet material is a sheet resin material and a sheet calcite material, wherein the sheet resin material is formed by mixing phenolic resin and melamine formaldehyde resin according to a mass ratio of 2:1 and tabletting.
The granular material is calcium carbonate and quartz granules.
The fiber material is a composite fiber material formed by mixing sepiolite fibers, asbestos wool and ceramic fibers according to the mass ratio of 1:1:1.
Specifically, 120g of the sheet material is weighed, wherein 60g of sheet resin material with the particle size of 1-3mm and 60g of sheet calcite material with the particle size of 1-3mm are weighed; 130g of the calcium carbonate particles are weighed, wherein 50g of calcium carbonate particles with the particle size of 0.5-1mm, 40g of calcium carbonate particles with the particle size of 1-2 mm and 40g of quartz particles with the particle size of 2-3.35 mm are weighed; 120g of the composite fiber material was weighed. And uniformly mixing the materials to obtain the high-temperature and high-pressure resistant drilling fluid plugging agent. And adding the plugging agent into 1000mL of drilling fluid to obtain plugging slurry.
Comparative example 3
Aiming at cracks of 5.0-3.0 mm, the plugging material provided by the embodiment consists of a sheet material, a particle material and a fiber material, wherein the mass concentration of each component in the plugging slurry is as follows:
120g/L of sheet material, 130g/L of granular material and 120g/L of fiber material;
the sheet material is a sheet resin material and a sheet calcite material, wherein the sheet resin material is formed by mixing phenolic resin and melamine formaldehyde resin according to a mass ratio of 2:1 and tabletting.
The granular material is calcium carbonate and quartz granules.
The fiber material is a composite fiber material formed by mixing sepiolite fibers, asbestos wool and ceramic fibers according to the mass ratio of 1:1:1.
Specifically, 120g of the sheet material is weighed, wherein 60g of sheet resin material with the particle size of 3-5 mm and 60g of sheet calcite material with the particle size of 3-5 mm are weighed; 130g of the calcium carbonate particles are weighed, wherein 50g of calcium carbonate particles with the particle size of 0.5-1mm, 40g of calcium carbonate particles with the particle size of 1-2 mm and 40g of quartz particles with the particle size of 2-3.35 mm are weighed; 120g of the composite fiber material was weighed. And uniformly mixing the materials to obtain the high-temperature and high-pressure resistant drilling fluid plugging agent. And adding the plugging agent into 1000mL of drilling fluid to obtain plugging slurry.
2. Performance testing
1. Particle size analysis
The particle size analysis of example 3 was performed by sieve analysis and the results are shown in table 1. It is known that the particle size of the material is concentrated below 4 meshes (4.75 mm), the material is distributed step by step, the types of plugging agents are multiple, the particle size distribution of each level is moderate, the particle size distribution coverage range is wider, the multi-level plugging can be completed, and the plugging agent is suitable for plugging slugs. FIG. 1 is a particle size distribution diagram of the plugging agent.
Table 1, data of particle size analysis of plugging agent of example 3
2. High temperature aging Performance test
The plugging agent obtained in example 3 was used for high temperature aging experiments, and the test procedure and results were as follows:
the high-temperature aging evaluation experimental procedure of the plugging agent comprises the following steps: (1) Weighing 3 parts of 5.000g of plugging agent by using a balance, respectively filling the plugging agent into 3 ageing tanks, filling drilling fluid into the ageing tanks, isolating oxygen in the air, sealing, putting the ageing tanks into a roller heating furnace at 200 ℃ for ageing for 24 hours, and taking out the ageing tanks; (2) And taking out the plugging agent after the ageing tank is cooled to room temperature, cleaning, drying, weighing, and calculating the mass loss rate K of the plugging agent before and after ageing. The calculation formula of the mass loss rate K is as follows: k=100 (5-M t ) 5, M t Is a plugging agent after high-temperature agingQuality. The experimental results are shown in table 2. Experimental results prove that: the plugging agent for sealing the high-temperature and high-pressure drilling fluid provided by the invention has the advantages of small mass loss rate under the high-temperature condition and excellent high-temperature resistance.
Table 2, high temperature aging test results of the plugging agent of example 3
| Sequence number | Mass/g of plugging agent before aging | Quality/g of plugging agent after aging | K/％ |
| 1 | 5.000 | 4.909 | 1.820 |
| 2 | 5.000 | 4.927 | 1.460 |
| 3 | 5.000 | 4.914 | 1.720 |
3. Plugging pressure bearing capability test
The plugging pressure-bearing capacity test is carried out by adopting the plugging slurries prepared in the example 3, the comparative example 1, the comparative example 2 and the comparative example 3 respectively, and the test process and the result are as follows:
placing a steel rock sample with the seam width of 3mm into a clamp holder, and applying confining pressure to 30MPa; adding the prepared plugging slurry into a working solution kettle body of a plugging instrument, starting an electric stirrer, setting the rotating speed to 150r/min, and opening a pressure regulating valve at the inlet end of the kettle body and a valve at the outlet end of a core holder; and starting a displacement pump to displace positively, increasing the pressure in the kettle body by using a gradient of 2.0MPa, keeping each pressure for 10min, measuring the accumulated leakage, rapidly increasing the accumulated leakage when the pressure in the kettle body reaches a certain pressure point, rapidly reducing the pressure in the kettle body, and considering that the crack plugging fails if the pressure is not recovered, stopping the experiment, and recording the pressure bearing capacity of the last pressure point as a plugging layer. The final plugging pressure curve and the cumulative leakage curve of example 3 are shown in fig. 2, and the experimental results show that: the pressure bearing capacity of the plugging layer formed by the high-temperature and high-pressure resistant drilling fluid plugging agent is more than 20MPa, so that the plugging effect of the invention is good. Fig. 3 is a physical diagram of the plugging agent of the invention forming a plugging layer in fractured steel rock.
| Project | Pressure bearing capacity/MPa | Cumulative leakage/mL |
| Example 3 | 20.0MPa | 8.8mL |
| Comparative example 1 | 6.0MPa | 24.6mL |
| Comparative example 2 | 10.0MPa | 85.4mL |
| Comparative example 3 | 16.0MPa | 158.3mL |
Note that: the maximum experimental pressure of the experiment is 20MPa.
4. Reverse plugging pressure bearing capability test
According to the plugging bearing capacity evaluation method, the plugging layer formed after the plugging bearing capacity test is displaced in the reverse direction of the displacement pump.
The final reverse plugging pressure curve is shown in fig. 4, and the experimental result shows that: the reverse bearing capacity of the plugging layer formed by the high-temperature and high-pressure resistant drilling fluid plugging agent is more than 7.0MPa and higher than that of the existing plugging agent, and the plugging agent has excellent anti-slurry-plugging and 'back-spitting' capacity.
3. Test examples
Test example 1
DF13-2-B15H well is a high-temperature high-pressure well in the west of south China sea, lost circulation occurs when the well is drilled to the well depth 5290m, the while-drilling slug is plugged by the formula of the embodiment 2, a drilling tool is placed at the position 50m above the bottom of the well (the well depth is about 5240 m) and the plugging slurry is pumped into the well at the position 38m by a displacement pump of 480L/min 3 After the plugging slurry exits the water hole of the drilling tool, returning the slurry normally until the pumping of the plugging slurry is completed; subsequently, slurry is replaced and pumped into 1.82g/cm 3 Well slurry 45.6m 3 When the slurry returning of the outlet is monitored to be normal, the displacement is gradually increased, the displacement is increased to 1400L/min at the highest, no leakage occurs, the drilling is started to 4770m, the BOP is closed for extrusion, 500L of extrusion is accumulated, the vertical pressure is increased to 857PSI (6 MPa), the pressure is relieved, the flow returns to 290L, no leakage occurs in later stage leakage inspection, and the leakage is successful.
Experimental example 2
YC23-1-1 well is a high-temperature and high-pressure well in the west of the south China sea, when the well is drilled to the well depth 4186.22m, the lost circulation occurs, the open hole section 861m (3325 m-4186 m),the liquid level of the monitored annulus drops to about 600m, and the subsequent hanging irrigation is 1.08g/cm 3 The liquid level slowly reaches the wellhead but cannot be kept stable, and the density of drilling fluid is 1.92g/cm when leakage occurs 3 The bottom hole temperature was about 200 ℃. Immediately pumping plugging slurry with drilling with concentration of about 18 percent in site by 40m 3 The wellhead is not exposed to the liquid level, then the drilling rod is changed to leak-stopping drilling tool, the formulation of the embodiment 3 is adopted to prepare the leak-stopping slurry, the leak-stopping slurry is pumped in from 60m (4120 m) above the bottom of the well, and the leak-stopping slurry is discharged out of the drilling tool by 13m 3 And after the wellhead starts to return out and replace the slurry, the wellhead starts to drill into the sleeve, the blowout preventer is closed to perform intermittent extrusion, the well slurry is extruded into 500L, the highest vertical pressure is up to 1020Psi, the pressure is stabilized for 30min, no pressure drop exists, the pressure is released slowly, and the backflow is 150L. After the plugging is finished, the drilling tool is replaced to continue drilling to the middle completion depth 4522m, no conditions such as lost circulation, overflow and the like occur during the drilling, and the plugging is successful.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (1)
1. The high-temperature and high-pressure resistant drilling fluid plugging agent is characterized by comprising a flaky material, a granular material and a fiber material, wherein the plugging agent is added into the drilling fluid to prepare plugging slurry and then injected into a stratum;
aiming at cracks of 5.0-3.0 mm, the mass concentration of each component in the plugging slurry is as follows:
120g/L of sheet material, 130g/L of granular material and 120g/L of fiber material;
wherein, in the sheet material, the mass ratio of the sheet resin material with the thickness of 1-3mm to the sheet resin material with the thickness of 3-5 mm to the sheet calcite with the thickness of 1-3mm to the sheet calcite with the thickness of 3-5 mm is 2:4:3:3; the flaky resin material is formed by mixing phenolic resin and melamine formaldehyde resin according to a mass ratio of 2:1 and tabletting, wherein the thickness is 0.3-0.5 mm, and the flaky resin material is smooth and textured on one side; the flaky calcite is a flaky sheet with soft texture and easy bending deformation;
the granular material is prepared by mixing 0.5-1mm calcium carbonate particles, 1-2 mm calcium carbonate particles and 2-3.35 mm quartz particles according to a mass ratio of 5:4:4;
the fiber material is a composite fiber material formed by mixing sepiolite fibers, asbestos wool and ceramic fibers according to the mass ratio of 1:1:1; the length of the fiber is 0.1-12 mm, and the diameter is 80-150 mu m.
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| CN202211046417.2A CN115322758B (en) | 2022-08-30 | 2022-08-30 | High-temperature and high-pressure resistant drilling fluid plugging agent |
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| CN115322758B true CN115322758B (en) | 2023-09-12 |
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